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首页> 美国政府科技报告 >A COMPARATIVE STUDY OF WEIGHTS AND SIZES OF FLAT-PLATE EXHAUST-GAS-TO-AIR HEAT EXCHANGERS WITH AND WITHOUT FINS
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A COMPARATIVE STUDY OF WEIGHTS AND SIZES OF FLAT-PLATE EXHAUST-GAS-TO-AIR HEAT EXCHANGERS WITH AND WITHOUT FINS

机译：不带翅片的平板式排气换气换热器重量和尺寸的比较研究

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Analytical comparisons of weights and volumes arc made for flat-plate boat exchangers having the same calculated thermal output and friction pressure drop for three different fin configura¬tions;namely, (l) no fin3, (2) fins in both the air and the exhaust gas passages, and (3) fins in the air passages only. Test data from two boat exchangers, one of configuration (l) and the other of configuration (2) are compared with the predicted weights and volumes. The thermal output and pressure—drop performance for these two exchangers, as evaluated from flight and ground tests, are also presented.nWith the use of fins in both the air and the exhaust-gas passages, reductions in volume of the heat-exchanger core of significant magnitude can be obtained. Weight reductions with this fin arrangement depend upon the design fin efficiency and the thickness of the fluid passage gaps. The largest reductions, in weight wore obtained with the lowest design fin efficiencies investigated, namely 70 percent, and in exchangers which have a large number of passages with the same size air and exhaust-gas passage gaps. Reductions in weight and volume with fins in the air passages only are not so large as occur with the use of fins in both passages.

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